Motor provided with cooling system

Abstract

A motor with a cooling system is provided. The motor includes a cooling system cooling a stator with coils wound on a core, in which the cooling system includes a plurality of spray pipes having a plurality of holes and spraying oil through the holes, the plurality of spray pipes is positioned between the stator and a housing of the motor, and the plurality of spray pipes includes pipes disposed at a center over the stator and at both sides spaced apart from each other in a circumferential direction of the stator from the center with predetermined gaps therebetween.

What is claimed is: 
     
       1. A motor comprising:
 a cooling system configured to cool a stator with coils wound on a stator core, 
 wherein the cooling system includes a plurality of spray pipes having a plurality of holes, 
 wherein the plurality of spray pipes sprays oil through the plurality of holes, 
 wherein the plurality of spray pipes is positioned between the stator and a housing of the motor, and 
 wherein the plurality of spray pipes includes pipes disposed at a center over the stator and at both sides spaced apart from each other in a circumferential direction of the stator from the center with predetermined gaps therebetween, 
 wherein the plurality of spray pipes includes:
 a first pipe elongated forward and rearward at a left side above the stator; 
 a second pipe elongated forward and rearward at a right side above the stator; and 
 a third pipe elongated forward and rearward at the center above the stator, 
 
 wherein the plurality of holes is formed at a rear portion of each of the first pipe and the second pipe to spray the oil to a portion of the coils protruding rearward from a rear end of the stator core, 
 wherein the plurality of holes is formed at a front portion of each of the first pipe and the second pipe to spray the oil to a portion of the coils protruding forward from a front end of the stator core, 
 wherein one hole of the plurality of holes is formed at the rear portion of each of the first pipe and the second pipe, 
 wherein the one hole of the plurality of holes is formed to spray the oil at an angle, 
 wherein the first pipe and the second pipe are configured to spray the oil to a first portion of the stator, and the third pipe is configured to spray the oil to a part of the first portion and a second portion of the stator, wherein the second portion of the stator is different from the first portion of the stator, and 
 wherein the first pipe and the second pipe are configured to only spray the oil to a front portion and a rear portion of the stator, and the third pipe is configured to only spray the oil to a middle portion and the rear portion of the stator. 
 
     
     
       2. The motor of  claim 1 , wherein the plurality of holes is formed at the third pipe and is arranged in a longitudinal direction of the third pipe, and
 the plurality of holes sprays the oil downward toward the stator core under the third pipe. 
 
     
     
       3. The motor of  claim 2 , wherein the plurality of holes includes:
 a hole formed at a rear portion of the third pipe to spray the oil vertically downward to a portion of the coils protruding rearward from a rear end of the stator core; and 
 a hole formed at a front-rear middle portion of the third pipe to spray the oil vertically downward to the stator core. 
 
     
     
       4. The motor of  claim 3 , wherein the hole formed at the front-rear middle portion of the third pipe is disposed at least one position of equally divided positions when a front-rear direction of the stator core is equally divided. 
     
     
       5. The motor of  claim 4 , wherein the hole formed at the front-rear middle portion of the third pipe is disposed at a ¼ point and a ¾ point of a front-rear length when the front-rear direction of the stator core is equally divided into four sections. 
     
     
       6. The motor of  claim 1 , wherein
 at least two holes of the plurality of holes are formed to be positioned in a same cross-section. 
 
     
     
       7. The motor of  claim 6 , wherein at least one hole of the plurality of holes formed to be positioned in the same cross-section is formed to spray the oil horizontally or in a predetermined first inclination direction close to the horizon and the other hole is formed to spray the oil in a second inclination direction that is a direction set downward further than the first inclination direction, and
 the other holes positioned behind the holes positioned in the same cross-section are formed to spray the oil horizontally or in a predetermined third inclination direction. 
 
     
     
       8. The motor of  claim 1 , wherein two holes of the plurality of holes are formed at the rear portion of each of the first pipe and the second pipe, and one hole of the two holes is formed to horizontally spray the oil and another hole of the two holes is formed to spray the oil downward at an angle. 
     
     
       9. The motor of  claim 1 , wherein the cooling system further includes:
 an oil guide disposed at an upper portion of a front side of the stator core in a circumferential direction of the stator core and guiding flow of oil sprayed from the holes of the spray pipes. 
 
     
     
       10. The motor of  claim 9 , wherein the oil guide is disposed over a portion of the coils protruding forward from a front end of the stator core to guide flow of oil sprayed toward the portion of the coils protruding forward through the holes of the spray pipes. 
     
     
       11. The motor of  claim 9 ,
 wherein the oil guide is configured to flow at least some of oil, which is sprayed to the stator core through a hole of the spray pipe disposed at the center over the stator, from a surface of the stator core to a surface of the oil guide, and 
 the oil guide is configured to direct the oil flowing along the surface of the oil guide to the stator core or the coils for cooling. 
 
     
     
       12. The motor of  claim 9 , wherein the oil guide is a plate-shaped member having an arc shape to be disposed in a circumferential direction of the stator core, and has an enlarged portion having a greater width than other portions at a center portion. 
     
     
       13. The motor of  claim 12 , wherein the oil guide is disposed such that a gap through which the oil sprayed to a top surface of the oil guide flows down is formed between the oil guide and a front end surface of the stator core. 
     
     
       14. The motor of  claim 12 , wherein a blocking portion that protrudes to block oil returning after hitting the coils is formed at the oil guide. 
     
     
       15. The motor of  claim 1 , wherein the cooling system further includes: an oil dam disposed under the stator to collect the oil at a predetermined level therein such that a lower portion of the stator is immersed in the oil. 
     
     
       16. The motor of  claim 15 , wherein the oil dam is formed such that a portion of a side of the oil dam is curved to be attached to an outer circumferential surface of the stator core, and an opening is formed through at least a portion of a bottom surface of the oil dam to expose an outer circumferential surface of a lower end of the stator core. 
     
     
       17. The motor of  claim 16 , wherein a wall blocking the lower end of the stator core and a lower end of the coils at a front is formed on a front side of the oil dam, and a front side wall of the oil dam has a height that is smaller by a predetermined value than a height of an inner side of the coils.